Grating structure



Nov. 27, 1928.

H. NAGIN GRTING STRUCTURE Filed Aug. 19. 1926 28 lNvcNToR Patented Nov. 27, 19 28.

UNITED sTATEsL-PATENT oFFlcE.

HARRY NAGIN, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR T0 TBI-LOK COMPANY, OF PITTSBURGH, PENNSYLVANIA, A" CORPORA TION OF PENNSYLVANIA.

GRATING STRUCTUBE.

Application flled August 19, 1926. Serial No. 130.139

This invention rela-tes to grating structure's and is particularly useful in connection with stair treads in grating form, although it has other applications.

Gratings of various sorts have been employed for stair treads for a long time, but they have been open to certain object-lons. Regardless of whether a person is looklng up or down the stairs, it is dificult in any kind of light to distinguish the edge of any particular step, and in consequence accidents frequently occur. VV'ith certain types of gratings the strength of the grating is reduced, or else its expense is increased, because of the necessity for specially fastening the girder bar which forms the edge of the stair tread in place. v

I provide a grating having a nosing along one edge thereof. This nosing may have a roughened tread face either formed directly on the nosing itself, oras a separate replaceable member. Preferably I employ a grating as described and claiined in my co-pending application, Serial No. 84,311, filed January 28th, v1926.

In such gratings there are employed girder bars having curved slots therein and substantially rectangular cross bars are forced into the slots. The slots are inclined in opposite directions in adj acent girder bars and the step of forcing the cross bars into place eauses permanent deformation of the parts thereof which engage the slots, thus looking the cross fbars into place. Although it is not essential, it is desirable that the cross bars pro ect a short distance beyond the girder bars' at the edge of the grating, and I therefore make these projecting end portions of the cross bars of reduced depth and utilize them for holding the nosing in place.

With a construction of this sort the Steps are all clearl defined, and one great dan er of accidents 1s thereby eliminated. I re er, however, to corrugate the cross bars i jacent the nosing and thus still further eliminate 'this hazard.

In the accompanyin drawings which illustrate a preferred emb and certainmodifications thereof,

Figure 1 is a. top plan view ofa portion of a stan`` tread grating embodying the invention; 'i'

4,Fi'u'e 2 is a section taken on the line 11-' of Figure 1;

'that above described iment of my invention Figure 3 is a section taken on the line III-III of Figure 2;

Figure 4 is al view to enlarged scale showingI the front. girder bar and a modified form ofy nosing in Vertical section;

Figure 5 is a view corresponding to Figure 3, but showing a still further modified form of nosing; and

Figure 6 is a top plan view of a. stairway landing showing the use of corrugated cross bars in the landing and also in the stair tread.

Referring first to Figures 1 to 3, there is shown a stair tread comprising girder bars 2, having curved slots 3 vvformcd therein. Cross bars 4 which are substantially rectangular in cross section are forced into the slots so as to permanently deform those portions of the cross balrs which engage the slots and thus lockthe cross bars into place. As shown in Figures 1 and 3, the slots are provided with curved bottoni portions 5 which are inclined inopposite directions 'in adjacent girder bars, thus producing loc-king tongues 6 and 6a extending in opposite directions.

The girder bar which lies at the front of the tread is indicated as 2. The cross bars have portions 7 which project beyond this girder bar. A nosing 8 is fit-ted over the projecting portions 7. The nosing comprises a Vertical portion 9, a tread portion 10 and an apron 11.l The portions 7 of the cross bars are preferably made of re'duced depth so that the upper face of the tread portion 10 will lie flush with the top of the grating proper. This tread face may be smooth or roughened, as desired. The Vertical portion 9 is provided with openings through which the portions 7 project and are riveted over as indi- 'cated at 7'.

Figure 4 shows avoonstruction similar to except that the upper face 12 of the nosing is placed below the top of the grating and a roughened tread member 13 is fastened thereon in any desired manner. This construction is desirable in certain instances as 'the tread surfaces are replaceable.

Figure 5 shows a still furthed modified form of nosing wherein the tread surface 14 project-s outwardly instead o'f inwardly. In bot-h the forms shown in Figures 4 and 5,-the nosings are secured to the cross' bars in the same way as the nosingsin Figures lato 3.

of the stairs and to these risers are secured stair treads indicated generally by the reference character 16. A landing, indicated bv the reference character 17, is also shown.

In both the landing and' the stair treads, no'sings'18, girder bars 19 and cross bars 20 are provided; It will be noted that the cross bars 20 are generally straight, but that near the edge of the stair treads, or ofthe landing, as the case may be, they are corrugated. A

' corrugated grating is more lfully disclosed and claimed in my co-pending application Serial No. 130,140, filed August 19, 1926, This corrugated construction more clearly indicates the'edgel of a trea'd and is, therefore, of value in preventing, accidents."

I have illustrated and described a preferred embodiment of the .invention but' it will be understood that dt is not thus limited, si'nce it may be otherwise e'mbodied Within the scope of the following claims.

I cla-imz- 1. A grating having a nosing along one 'edge thereof, the nosing having a separate roughened tread member whose top surface is substantially flush with the tread surface w of thegrating.

2. A grating having a nosing along one edge'thereof, the nosing having a'separ'ate removable tread member Whose top surface is substantially flush With the tread surface of 'the grating.

3. A grating comprising 'a plurality of girder bars and cross bars extending across the several girder bars, the cross bars projecting beyond a girder bar at one side of the .grating and a nosing running alongside said and a nosmg secured to the cross bars.

girderbar and secured to the cross bars.

W. A grating comprising a plurality. of girder barsandv cross bars extending across the several` girder bars, the cross bars project- Iing beyond a girder bar at one side of the grating and a nosing running alongside said girder' bar and secured to the cross bars, the cross bars being corrugated adjacent the nosmg.

5. A grating comprising girder bars and cross bars secured thereto` the cross bars ro- `jecting beyond a girder bar at one side o the ing beyond a girder grating, a nosing lying alongside the girder bar and secured to lthe projecting portions of the cross bars, such projecting portions being of reduced section so as to leave the top of the nosing flush withthe top`of the gratlng.

6. A gratin comprising a plurality of girder bars an cross bars extending in substantially straight lines across a portion of the)grat1ng, the cross bars being corrugated adjacent an edge of the grating, and a nosw ing alongside said edge portion.

7. A grating comprising a plurality of girder bars and cross bars extending across the several girder bars, the cross bars extending in substantially straight lines over a portion of the grating, but being corrugated adjacent an edge thereof.

8. A grating, .comprising a plurality of notched girder bars and cross bars lying in the no't'ches and extending through ay plurality ofthe girder bars the cross bars projectbar at one 'edge of the grating, and aj nosing secured to the projectin" cross bar portions.

'A grating, comprising a plurality of .notched girder bars and cross bars lying in the notchesand extending through a plurality of the girder bars the cross bars projecting beyond a girder bar at one edge of the grating, and a nosing secured to the projecting cross bar portions, the top of the nosing being on substantially the same level a the w top of the girder bars.

10. A gratin ,comprising a' plurality of girder bars an cross bars extendin over the several girder bars and secured to t e'several girder bars, the cross bars projecting beyond a girder bar at one side of the grating,

of the cross bars, the cross bars being secured to a girder bar remote :from the nosing.

In testimony whereof I -have hereunto set my hand.

` HARRY NAGIN, 

